Severe traumatic injury is associated with profound changes in DNA methylation

Area of Science:

• Epigenetics
• Molecular Biology
• Trauma Research

Background:

• The impact of severe physical trauma on DNA methylation patterns in humans remains largely unexplored.
• Understanding epigenetic modifications following trauma is crucial for comprehending the body's response to injury.

Purpose of the Study:

• To investigate whether severe trauma is associated with significant changes in DNA methylation.
• To identify specific genes and pathways affected by trauma-induced epigenetic alterations.

Main Methods:

• A prospective, observational clinical study comparing severely injured adults with controls undergoing elective surgery.
• Epigenome-wide DNA methylation profiling of blood samples collected at multiple time points post-trauma and post-surgery.
• Analysis of differentially methylated CpGs (CpG sites) and DMRs (differentially methylated regions) within and between groups.

Main Results:

• Severe trauma was associated with 10,126 differentially methylated CpGs and 1169 DMRs in circulating leukocytes.
• No significant differential methylation was observed in the control surgical group.
• Differentially methylated sites in trauma patients were enriched in genes and pathways involved in blood coagulation and inflammatory response.

Conclusions:

• Severe physical trauma induces profound and widespread alterations in the DNA methylome of circulating leukocytes.
• These epigenetic changes are concentrated in genes and pathways relevant to the body's response to trauma, such as inflammation and coagulation.
• The findings provide insights into the molecular mechanisms underlying the physiological response to severe injury.